Organic electroluminescent display device with improved image clarity and light emitting efficiency

• US 7,211,945 B2
• Filed: 06/28/2004
• Issued: 05/01/2007
• Est. Priority Date: 06/30/2003
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Ki Dong
• Primary Examiner(s): Patel; Nimeshkumar D.
• Assistant Examiner(s): Walford; Natalie K.
• Application Number:
  US10/876,612
• Publication Number:
  US 20040263070A1
• Time in Patent Office: 1,037 Days
• Field of Search: 313/501, 313/504, 313/505, 313/506
• US Class Current: 313/504
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

An organic electroluminescent (EL) display device is provided which includes a film with a multi-dimensional grating pattern formed on a surface thereof. The display device includes a transparent substrate, a first electrode formed on the transparent substrate, an organic light emitting layer formed on the first electrode, a second electrode formed on the organic light emitting layer. The is provided at a bottom of the transparent substrate. A display device employing this film with a multi-dimensional grating pattern provides improved light emitting efficiency and enhanced image quality.

Claims

1. An electroluminescent display device, comprising:

a transparent substrate;

a first electrode formed on the transparent substrate;

a light-emitting layer formed on the first electrode;

a second electrode formed on the light-emitting layer; and

a film having a grating pattern, the grating pattern comprising a plurality of grating components formed on a surface thereof, wherein each grating component of the grating pattern extends in the X, Y and Z dimensions, wherein the plurality of grating components comprises a plurality of projections arranged in a matrix form which each extend outward from a base portion of the film, and wherein each interval between adjacent projections of the plurality of projections is less than or equal to approximately half of a corresponding reflective light wavelength.

2. The device of claim 1, wherein each interval between adjacent projections is less than approximately 200 nm.

3. The device of claim 1, wherein the base portion of the film is provided on a bottom surface of the transparent substrate, and the light-emitting layer is provided on a top surface of the transparent substrate.

4. The device of claim 1, wherein each of the plurality of projections is formed in one of a polyhedral, semi-spherical, and circular form.

5. The device of claim 4, wherein each of the plurality of projections comprises a hexahedral form which extends from a base portion of the film.

6. The device of claim 1, wherein the film comprises a macromolecular material configured to intensify heat or ultraviolet rays, and wherein the film has a light transmissivity of greater than approximately 85%.

7. The device of claim 1, the film having with a grating pattern formed on a surface thereof comprises two different materials, each material having a different refractive index.